> > z-index only applies to positioned content to start with.
>
> pardon?
http://www.w3.org/TR/CSS2/visuren.html#propdef-z-index
Applies to: positioned elements
CSS2.1 says the same thing.
"positioned elements" in this context means "anything with position not
static".
> and relative position may be problem, as well as fixed one;
> out-of-flow position make overlapping among elements.
> so style have to define which element is front and other is back
> in that situation clearly.
It's completely well-defined by the z-ordering description in the spec, as far
as I can tell....
Boris
--
We are all agreed that your theory is crazy. The
question which divides us is whether it is crazy enough
to have a chance of being correct. My own feeling is
that it is not crazy enough.
-- Niels Bohr